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Income Taxes (Narrative) (Details) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2012 USD ($)
Income Tax Examination [Line Items] |  |  |  |  |  |  |  |
Deferred Tax Assets, Valuation Allowance |  |  |  | $ 55.4 | $ 51.6 |  |  |
Income tax expense |  |  |  | 16.6 | 56.7 | $ 51.2 | $ 24.0 |
Income before income tax |  |  |  | $ 78.6 | $ 163.5 | $ 157.9 |  |
Effective tax rate |  |  |  | 21.10% | 34.70% | 32.40% |  |
Excess benefit from stock-based compensation |  |  |  | $ (0.9) | $ (0.2) | $ 2.5 |  |
U.S. statutory rate |  |  |  | 21.00% |  |  | 35.00% |
Amended return expected benefit |  |  |  |  | 1.4 | 1.1 |  |
Transition toll tax and net benefit or revaluation of deferred tax assets and liabilities |  |  |  |  |  |  | 49,700,000 |
Tax Cuts and Jobs Act, Measurement Period Adjustment, Income Tax Expense (Benefit) |  |  |  |  |  | 3.1 |  |
Tax Cuts and Jobs Act, Transition Tax, Income Tax Expense |  |  |  |  |  | 0.3 |  |
Tax Cuts and Jobs Act, Effect on Executive Compensation, Income Tax Expense |  |  |  |  |  | 3.3 |  |
Tax Cuts and Jobs Act, Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions, Executive Compensation |  |  |  |  |  | 1.5 |  |
Tax Cuts and Jobs Act, Impairment of Deferred Tax Assets, Executive Compensation, Income Tax Expense |  |  |  |  |  | 1.8 |  |
Tax Cuts and Jobs Act, Change in Tax Rate, Deferred Tax Asset - Pension, Income Tax Benefit |  |  |  |  |  | 0.5 |  |
Additions for tax positions of prior years |  |  |  | $ 2.9 | 8.4 | 3.1 |  |
Deferred Federal Income Tax Expense (Benefit) - Undistributed Earnings of Foreign Subsidiaries |  |  |  | 4.6 |  |  |  |
Undistributed Earnings of Foreign Subsidiaries Not Permanently Reinvested |  |  |  | 328.0 |  |  |  |
Undistributed earnings of foreign subsidiaries |  |  |  | 219.0 |  |  |  |
Unrecognized tax benefits, income tax penalties and interest accrued |  |  |  | 26.5 |  |  |  |
Unrecognized tax benefits |  |  |  | 45.1 | 50.5 | 43.7 | $ 47.2 |
Foreign tax credit carryforwards |  |  |  | 23.3 | 25.2 |  |  |
Operating loss carryforwards, valuation allowance |  |  |  | 88.1 |  |  |  |
Minimum |  |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |  |
Reasonably possible change in unrecognized tax benefit |  |  |  | 3.0 |  |  |  |
Maximum |  |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |  |
Reasonably possible change in unrecognized tax benefit |  |  |  | 4.0 |  |  |  |
State and Local Jurisdiction |  |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |  |
Operating loss carryforwards |  |  |  | $ 14.9 |  |  |  |
State and Local Jurisdiction | Minimum |  |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |  |
Statutes of limitation, period |  |  |  | 2 years |  |  |  |
State and Local Jurisdiction | Maximum |  |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |  |
Statutes of limitation, period |  |  |  | 5 years |  |  |  |
Foreign Tax Authority |  |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |  |
Operating loss carryforwards |  |  |  | $ 430.0 |  |  |  |
Foreign Tax Authority | Minimum |  |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |  |
Statutes of limitation, period |  |  |  | 2 years |  |  |  |
Foreign Tax Authority | Maximum |  |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |  |
Statutes of limitation, period |  |  |  | 5 years |  |  |  |
Foreign Tax Authority | Australian Taxation Office | Earliest Tax Year |  |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |  |
Open tax year |  |  |  | 2015 |  |  |  |
Foreign Tax Authority | Secretariat of the Federal Revenue Bureau of Brazil |  |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |  |
Income tax expense |  | $ 1.6 |  |  |  |  |  |
Penalty rate |  |  |  | 75.00% |  |  |  |
Potential penalty rate |  |  |  | 150.00% |  |  |  |
Effective Income Tax Rate Reconciliation, Prior Year Income Taxes - Foreign, Amount |  |  |  | $ 5.6 |  |  |  |
Income tax examination, interest expense |  |  |  | $ 0.3 | $ 0.9 | 1.1 |  |
Foreign Tax Authority | Secretariat of the Federal Revenue Bureau of Brazil | Earliest Tax Year |  |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |  |
Open tax year |  |  |  | 2016 |  |  |  |
Foreign Tax Authority | Secretariat of the Federal Revenue Bureau of Brazil | Tax Years 2007-2012 |  |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |  |
Unrecognized tax benefits |  |  |  |  |  |  |  | $ 44.5
Potential tax assessment, accrued reserve related to fair value of liabilities acquired |  |  |  |  |  |  |  | $ 43.3
Foreign Tax Authority | Secretariat of the Federal Revenue Bureau of Brazil | Tax Year 2008 to 2010 |  |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |  |
Additions for tax positions of prior years | $ 1.2 |  | $ 5.6 |  |  |  |  |
Foreign Tax Authority | Canada Revenue Agency | Earliest Tax Year |  |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |  |
Open tax year |  |  |  | 2016 |  |  |  |
Foreign Tax Authority | Federal Ministry of Finance, Germany | Earliest Tax Year |  |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |  |
Open tax year |  |  |  | 2015 |  |  |  |
Foreign Tax Authority | Swedish Tax Agency (Skatteverket) | Earliest Tax Year |  |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |  |
Open tax year |  |  |  | 2015 |  |  |  |
Foreign Tax Authority | Her Majesty's Revenue and Customs (HMRC) | Earliest Tax Year |  |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |  |
Open tax year |  |  |  | 2019 |  |  |  |
Domestic Tax Authority |  |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |  |
Federal General business credit carryforwards |  |  |  | $ 2.1 |  |  |  |
Domestic Tax Authority | Internal Revenue Service (IRS) |  |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |  |
Tax Cuts and Jobs Act, income tax benefit |  |  |  |  |  |  | (25.7) |
Foreign tax credit carryforwards |  |  |  |  |  |  | $ 14.0 |
Domestic Tax Authority | Internal Revenue Service (IRS) | Earliest Tax Year |  |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |  |
Open tax year |  |  |  | 2017 |  |  |  |
UNITED STATES | Pension |  |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |  |
Defined Benefit Plan Contributions By Employer, Additional Tax Deductible Contribution |  |  |  |  |  | $ 4.1 |  |
Other Noncurrent Liabilities | Foreign Tax Authority | Secretariat of the Federal Revenue Bureau of Brazil | Tax Year 2007 to 2010 [Member] |  |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |  |
Unrecognized tax benefits |  |  |  | $ 28.4 |  |  |  |

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